如何在Gulp中添加特定的bower组件作为IE8条件块 [英] How to add specific bower components as IE8 conditional block in Gulp

问题描述

我有几个bower组件，其中我需要一些组件，如 json3 ， respondjs ， es5shim 将添加到IE8条件块（在构建和服务中），如下所示：

I have several bower components, of which I need some components like json3, respondjs, es5shim to be added in an IE8 conditional block (in build as well as serve) like this :

<！ - [if lt IE 9]>
< script src =bower_components / json3 / json3.js>< / script>
<！[endif] - >

我应该如何继续编写任务？对于此问题，我找不到任何合适的示例 gulp-inject 以及 wiredep 。请告知

How should I proceed to write the task? I could not find any suitable examples with gulp-inject as well as wiredep for this issue. Please advise

推荐答案

可以使用 gulp-filter 和 gulp-inject的starttag选项。

假设您在索引中定义了以下注入。 html ：

<!--[if lt IE 9]>
<![endif]-->
<!-- inject:js -->
<!-- endinject -->

您可以在gulpfile中连接它们：

You can wire them in gulpfile:

var gulp = require('gulp')
var bowerFiles = require('main-bower-files');
var gulpFilter = require('gulp-filter');
var gulpInject = require('gulp-inject');

gulp.task('wiredep', function() {
    var ie8Files = ['**/json3.js', '**/es5shim.js'];
    // the same as: var restFiles = ['*', '!**/json3.js', '!**/es5shim.js'];
    var restFiles = ['*'].concat(ie8Files.map(function(e) { return '!' + e;}));
    return gulp.src('index.html')
    .pipe(gulpInject(gulp.src(bowerFiles(), {read: false}).pipe(gulpFilter(restFiles))))
    .pipe(gulpInject(gulp.src(bowerFiles(), {read: false}).pipe(gulpFilter(ie8Files)),
                    {starttag: '<!--[if lt IE 9]>', endtag: '<![endif]-->'}))
    .pipe(gulp.dest('dist'));
});

导致（例如）：

<!--[if lt IE 9]>
<script src="bower_components/json3/json3.js"></script>
<script src="bower_components/shim/es5shim.js"></script>
<![endif]-->
<!-- inject:js -->
<script src="bower_components/jquery/jquery.js"></script>
<!-- endinject -->

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